ms series multi-stage electronic temperature controls
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Master Catalog 125 Temperature Controls Section A Product Bulletin MS Issue Date 0618
© 2018 Johnson Controls 1
Code No. LIT-125198
MS Series Multi-Stage Electronic Temperature Controls
The MS Series Controls are versatile, microprocessor-based, multifunction, programmable temperature controls. They are designed for single and multiple stage temperature control applications.
Depending on the model selected, the MS Series Controls can operate in the following modes:
Direct mode
Reverse mode
Deadband mode
Independent Setpoint mode
The MS Series Controls have large, easy-to-read, red Light-Emitting Diode (LED) displays. These compact controls are available in Panel Mount and DIN Rail Mount models. MS Series Controls use the A99B temperature sensors, which allow remote mounting of the display unit.
Figure 1: MS4 Panel Mount and DIN Rail Multi-Stage Electronic Temperature Controls
Features and Benefits
Programmable Functions Allows adjustment of control settings to meet
application needs
Alarm Management
Functions
Provides visible alarm codes on the display
Easily Readable LED
Display
Displays temperature and functions quickly
and clearly
Programming Button
Lockout
Allows user to disable programming buttons
and deter accidental or unauthorized changes
Accurate Sensors for
Temperature
Provides accurate control performance with up to
300 feet of wiring (an adjustable offset is provided
for longer wiring)
Self-Test Procedure Checks control operation by cycling all
outputs and testing all LEDs
2 MS Series Product Bulletin
Overview
IMPORTANT: All MS Series Controls are designed for use only as operating controls. Where an operating control failure would result in personal injury or loss of property, it is the responsibility of the installer to add devices (safety, limit controls) or systems (alarm, supervisory systems) that protect against, or warn of, control failure.
Refer to a specific model’s installation bulletin for the necessary information on installation, use, and servicing.
Table 1: Selected Applications
MS1 MS2 MS4 Application
Cooling tower pump and/or
fan control
Rooftop heating or cooling
units
Boiler or pump control
Space temperature control
Compressor or chiller staging
Mode Selection
Mode Selection allows selection of one of several modes, depending on the model:
Direct mode for cooling applications
Reverse mode for heating applications
Deadband mode for applications requiring cooling and heating with a common setpoint and a deadband
Independent Setpoint mode for applications requiring cooling and heating with an independent setpoint for each
Stage Control Functions
Adjustable Setpoint Stops restrict setpoint adjustment to avoid extreme settings. The setpoint cannot be changed to a value outside of these stops.
Soft Start controls the rate at which temperature approaches the setpoint on power up, both initially and when the binary input is configured as a remote shutoff.
Anti-short Cycle Delay avoids situations where the equipment starts, stops, and restarts in a short period of time. This feature determines the minimum time between two subsequent On cycles of the equipment.
Binary Input Functions
The MS2 and MS4 controls are equipped with a binary input that can perform one of the following functions:
Shutoff and Alarm Signaling: When the binary input is open for a time longer than the binary input time delay, all outputs are shut off and an alarm message is displayed. Restart does not use the soft start feature.
Setback: When the binary input is open, the setpoints are shifted by a preset value in order to save energy.
Remote Shutoff: When the binary input is open for a time longer than the binary input time delay, all outputs are shut off and an alarm message is displayed. Restart uses the soft start feature.
MS Series Product Bulletin 3
Dual Sensor Temperature Reset
This feature resets the Setpoint based on the difference between temperature reading from the Auxiliary Temperature Sensor (ATS) and the setpoint. This feature is available only on the MS4 Series and can only be used when the ATS is connected.
Alarm Management Functions
High and Low Temperature Alarms have setpoints relative to the main setpoint. If the temperature reaches or exceeds the alarm values, the display flashes a specific alarm message. On the MS1, an alarm output circuit is energized. The MS2 and MS4 controls have no alarm output. Alarms are disabled for 20 minutes after startup in addition to the alarm time delay.
Alarm Time Delay is used to avoid short-duration events triggering the alarm.
Alarm Differential can be set to keep the alarm from cycling rapidly on and off.
Sensor Failure is indicated by an alarm message on the display.
Alarm codes are displayed by the LEDs and are used to help troubleshoot errors. Alarm codes exist for these conditions:
process sensor failure
high temperature alarm
low temperature alarm
program failure
binary input codes
Self-Test Procedure
The self-test procedure allows the user to verify that the LEDs and outputs of an MS control are operating correctly before the control is put into service.
Additional Features
Programming Button Lockout allows the programming buttons to be deactivated, which deters accidental or unauthorized modifications to the settings.
Sensor Offset allows programming an offset of the measured temperature for use with sensor leads longer than 300 ft.
Display Updating Time provides an adjustable refresh rate to avoid displaying short duration fluctuations.
Units of Measurement for temperature measurement can use either Fahrenheit or Celsius temperature scales.
D imensions
1 1/8
(28)
2 11/16
(68)
2 5/16
(58)
1 3/8
(35)
2 3/4
(70) 3
(75)
1/4
(6)
2
(50)
(2000)
78 3/4
Figure 2: Panel Mount Control and A99 Sensor, in. (mm)
(45)
1
(118)
4
(52.5)
2 1/8 (70)
2 3/4
13
16 16
11
Figure 3: DIN Rail Mount Control, in. (mm)
4 MS Series Product Bulletin
Display
The display has two 7-segment LEDs and a minus (-) indication to display temperatures from -40 to 99°F (-40 to 70°C), with 1F° (C°) resolution. Three individual stage status LEDs display the relay status.
LED indicates Relay Output 1 is energized.
LED indicates Relay Output 2 is energized.
LED indicates Relay Output 3 is energized.
The MS1 has one stage status LED. The MS2 has two stage status LEDs. The MS4 has three stage status LEDs.
EnterButton
Stage Status LEDs
UpButton
DownButton
Figure 4: Panel Mount Front Panel and Display
Up Button
Down Button
Stage Status LEDs
Figure 5: DIN Rail Mount Front Panel and Display
The MS1 has one stage status LED. The MS2 has two stage status LEDs. The MS4 has three stage status LEDs.
Modes of Operation
The MS1 Series Control performs temperature and alarm management for single-stage applications. It operates in either Direct or Reverse modes.
The MS2 Series Control performs temperature management for 2-stage applications. In addition to the MS1 modes, it has Deadband and Independent Setpoint modes for applications that require both cooling and heating.
The MS4 Series Control performs temperature management for 4-stage applications. It has the same mode selection as the MS2. It can automatically adjust the setpoint to save energy, based on readings from the auxiliary temperature sensor and the function settings.
Table 2: Modes of Operation
MS1 MS2 MS4 Modes of Operation
Direct (Cooling)
Reverse (Heating)
Deadband (Cooling and
Heating)
Independent Setpoint
(Cooling and Heating)
The illustrations on the following pages show the modes that each MS Series Control is capable of using.
MS Series Product Bulletin 5
Direct Mode (Cooling)
Temperature
On
Off Setpoint
On
Off
Setpoint 2(Offset from
Setpoint)
On
Off
Setpoint 3(Offset from Setpoint)
On
Off
Setpoint 4(Offset from Setpoint)
Time
Differential
Differential 2
Differential 3
Differential 4
Stage 1
Stage 2
Stage 3
Stage 4
InterstageTimeDelay
InterstageTimeDelay
InterstageTimeDelay
Figure 6: Direct Mode
Direct mode is used for cooling applications. The MS1 has one stage. The MS2 has two stages. The MS4 has four stages. Where desirable, stages may overlap or have space between them.
Setpoint is the desired temperature.
Differential is the operational range of Stage 1.
Setpoint 2 is the offset from setpoint that activates Stage 2.
Differential 2 is the operational range of Stage 2.
Setpoint 3 is the offset from setpoint that activates Stage 3.
Differential 3 is the operational range of Stage 3.
Setpoint 4 is the offset from setpoint that activates Stage 4.
Interstage Time Delay is the minimum amount of time between two successive stages when multiple stages are called for in rapid sequence.
6 MS Series Product Bulletin
Reverse Mode (Heating)
Temperature
Setpoint
On
Off
Off
On
On
Off
Setpoint 4(Offset from
Setpoint)
Off
On
Setpoint 2(Offset from
Setpoint)
Setpoint 3(Offset from
Setpoint)
InterstageTime Delay
InterstageTime Delay
InterstageTime Delay
Stage 1
Stage 2
Stage 3
Stage 4
Differential
Differential 2
Differential 3
Differential 4
Time
Figure 7: Reverse Mode
Reverse mode is used for heating applications. The MS1 has one stage. The MS2 has two stages. The MS4 has four stages. Where desirable, stages may overlap or have space between them.
Setpoint is the desired temperature.
Differential is the operational range of Stage 1.
Setpoint 2 is the offset from setpoint that activates Stage 2.
Differential 2 is the operational range of Stage 2.
Setpoint 3 is the offset from setpoint that activates Stage 3.
Differential 3 is the operational range of Stage 3.
Setpoint 4 is the offset from setpoint that activates Stage 4.
Differential 4 is the operational range of Stage 4.
Interstage Time Delay is the minimum amount of time between two successive stages when multiple stages are called for in rapid sequence.
MS Series Product Bulletin 7
Deadband Mode
Cooling
Heating
Setpoint
Stage 1
Stage 2
Stage 4
Stage 3
Differential
Differential 2
Differential 4
Differential 3
InterstageTime Delay
InterstageTime Delay
Temperature
Time
Setpoint 4(Offset from Stage 2)
Setpoint 3(Offset from Stage 1)
Setpoint + (1/2 Setpoint 2)
Setpoint - (1/2 Setpoint 2)
Figure 8: Deadband Mode
Deadband mode is used for applications requiring cooling and heating. The MS2 has two stages. The MS4 has four stages. Where desirable, stages may overlap or have space between them.
Setpoint is the desired temperature.
Differential is the operational range of Stage 1.
Setpoint 2 is width of the deadband, which is centered on setpoint.
Differential 2 is the operational range of Stage 2.
Setpoint 3 is the offset from the low end of the deadband that activates Stage 3.
Differential 3 is the operational range of Stage 3.
Setpoint 4 is the offset from the high end of the deadband that activates Stage 4.
Differential 4 is the operational range of Stage 4.
Interstage Time Delay is the minimum amount of time between two successive stages when multiple stages are called for in rapid sequence.
8 MS Series Product Bulletin
Independent Setpoint Mode
Cooling
Heating
Setpoint
Stage 1
Stage 2
Stage 4
Stage 3
Differential
Differential 2
Differential 4
Differential 3
InterstageTime Delay
InterstageTime Delay
Temperature
Time
Setpoint 4
Setpoint 3
Figure 9: Independent Setpoint Mode
Independent Setpoint mode is used for applications requiring cooling and heating. The MS2 has two stages. The MS4 has four stages. Where desirable, stages may overlap or have space between them.
Setpoint is the desired heating temperature. It is the basis for the reverse stages.
Differential is the operational range of Stage 1.
Setpoint 2 the desired cooling temperature programmed by the user. It is the basis for the direct stages.
Differential 2 is the operational range of Stage 2.
Setpoint 3 is the offset from Setpoint that activates Stage 3.
Differential 3 is the operational range of Stage 3.
Setpoint 4 is the offset from Setpoint 2 that activates Stage 4.
Differential 4 is the operational range of Stage 4.
Interstage Time Delay is the minimum amount of time between two successive stages when multiple stages are called for in rapid sequence.
MS Series Product Bulletin 9
Function Definitions
The MS Series controls include a variety of temperature and alarm management functions, which are listed below. Not all of these functions are available on every model.
Refer to Table 3 for functions and setting ranges for specific models.
Temperature Management
Setpoint is the primary control point programmed by the user.
Setpoint 2, Setpoint 3, Setpoint 4 depend on the mode used. For information on function in each mode, see Modes of Operation.
Differentials (or hysteresis) establishes the difference between the value at which the output is switched Off and the value at which the output is switched On. For further information, see Modes of Operation.
Example: In Direct (cooling) mode, with the setpoint at 40°F, and the differential at 4F°, the compressor is switched On when the temperature goes above 44°F, and is turned Off when the temperature decreases to below 40°F.
High and Low Setpoint Stops are temperature
settings (F or C) that define how high and low the primary setpoint may be adjusted. Setpoint stops deter unauthorized or accidental overadjustment of setpoint.
Anti-short Cycle Timer, Direct establishes the minimum time in minutes between two subsequent On cycles of Direct (cooling) stages.
Anti-short Cycle Timer, Reverse establishes the minimum time in minutes between two subsequent On cycles of reverse (heating) stages.
Load Demand
Output Status
Anti-short Cycle Timer
Figure 10: Anti-short Cycle Timer
Interstage Time Delay is the minimum amount of time between two successive stages when multiple stages are called for in rapid sequence.
Soft Start controls the rate at which the process temperature is allowed to approach the setpoint on power up, both initially and when the binary input is configured as remote shutoff. The setting is minutes/temperature units, such as minutes/F°.
Example:
Process temperature = 20° Setpoint = 30° Soft start = 2 minutes
Rate of Increase = Soft start x (setpoint – sensor reading)
Process setpoint increases by 1° every two minutes, until the setpoint temperature is reached. To go from 20° to 30° takes 10 minutes.
Temperature Sensor Offset allows the user to compensate for temperature differences between actual and displayed temperature, such as those experienced when using long sensor leads or when the location of the sensor results in inaccurate readings.
Temperature Units allows the user to select either the Fahrenheit or Celsius temperature scale.
Display Refresh Rate establishes the time delay (seconds) between updates of the temperature display.
10 MS Series Product Bulletin
Heating Reset and Cooling Reset are used in Deadband mode. The reset is an automatic shift of the setpoint, based on the temperature at the Auxiliary Temperature Sensor (ATS).
Non-compensated Band establishes the temperature
range (F or C) over which reset does not take place.
Alarm Management
High Temperature Alarm sets the temperature
(F or C) relative to setpoint at which the control goes into a high temperature alarm condition.
Example: If setpoint is 40°F and high temperature alarm is 15F°, the alarm message will be displayed at or above 55°F.
Low Temperature Alarm sets the temperature
(F or C) relative to setpoint at which the control goes into a low temperature alarm condition.
Example: If setpoint is 40°F and low temperature alarm is -10F°, an alarm message will be displayed at or below 30°F.
Alarm Differential establishes the difference
(F or C) between the temperature at which the alarm is activated and the temperature at which the alarm is deactivated. On the MS1, alarm activation triggers an external alarm and displays an alarm message. On the MS2 and MS4, an alarm message is displayed.
Example (cooling): Setpoint = 40°F High Temperature Alarm = 15F° Alarm Differential = 2F°
When the room temperature exceeds 40 + 15 = 55°F for a time greater than the alarm time delay setting, the alarm message is displayed; however, it will reset after the temperature drops below 40+15-2=53°F.
Alarm Time Delay establishes the time delay (minutes) between reaching an alarm condition (high or low temperature) and activating the alarm. This function reduces nuisance alarms caused by transient changes that temporarily exceed alarm setpoint temperatures. Conditions that would cause a temperature alarm are disregarded by the unit during the first 20 minutes after power up.
Binary Input
Binary Input Function allows the user to select how the binary input will activate the stage control contacts. The user can select to disengage this function or set one of three actions:
Shutoff and Alarm Signaling - If the binary input contact is open for a time longer than that set through the binary input time delay, the stage control contacts are switched Off, and an alarm message (A1) is displayed. On the MS1, the alarm is also activated.
Setback - If the binary input contact is open for a time longer than that set through the binary input time delay, the setpoints are shifted by setback. Reverse setpoints (heating) decrease. Direct setpoints (cooling) increase.
Remote Shutoff of the outputs. - If the binary input contact is open for a time longer than that set through the binary input time delay, the stage control contacts are switched Off.
If a set of stage control contacts are used to control an external alarm, this function should be disabled.
Binary Input Time Delay establishes the time delay (minutes) between binary signal reaching the control and control’s response to the binary signal.
Setback determines the value of the setpoint shift when the binary input is open and the binary input function is set at setback.
MS Series Product Bulletin 11
Temperature Reset
Heating reset, cooling reset, and Non-compensated Band (NCB) are used only with the MS4. Heating reset only affects the heating setpoint, and cooling reset only affects the cooling setpoint. These functions appear only when the Auxiliary Temperature Sensor (ATS) is connected.
Heating Reset
When the ATS reading is lower than the setpoint, and the difference exceeds the deadband, temperature reset will take place. The setpoint will be lowered. Degrees of reset are equal to:
[ATS – (setpoint – NCB)] / heating reset
Cooling Reset
When the Auxiliary Temperature Sensor (ATS) reading is higher than the setpoint, and the difference exceeds the deadband, temperature reset will take place. The setpoint will be raised. Degrees of reset are equal to:
[ATS – (setpoint + NCB)] / cooling reset
Non-compensated Band (NCB)
The temperature range over which reset does not take place.
Temperature Reset Examples
Heating Reset Example: Setpoint = 70° Auxiliary Temperature Sensor (ATS) = 42° NCB = 20° Heating Reset = 2°
Step 1 ATS–(setpoint–NCB) = differential 42 – (70 – 20) = -8
Step 2 differential/heating reset = reset -8/2 = -4
Step 3 setpoint + reset 70 + (-4) = 66
Setpoint is reset to 66° to save energy.
Cooling Reset Example: Setpoint = 70° Auxiliary Temperature Sensor (ATS) = 92° NCB = 10° Cooling Reset = 2°
Step 1 ATS–(setpoint + NCB) = differential 92 – (70 + 10) = 12
Step 2 differential/cooling reset = reset 12/2 = 6
Step 3 setpoint + reset 70 + 6 = 76
Setpoint is reset to 76° to save energy.
42°
Heating Reset
Only Affects Heating Stages
Cooling Reset
Only Affects Cooling Stages
Setpoint
Deadband NCB = 10°
80° 92°70°
76°
70°
ProcessTemperature
50° 70°
Setpoint
Deadband NCB = 20°
1°Heating Reset
1°CoolingReset
70°
66°
AuxiliaryTemperature
Sensor(ATS)
AuxiliaryTemperature
Sensor(ATS)
12 MS Series Product Bulletin
42°
Heating Reset
Only Affects Heating Stages
Cooling Reset
Only Affects Cooling Stages
Setpoint
Deadband NCB = 10°
80° 92°70°
76°
70°
ProcessTemperature
50° 70°
Setpoint
Deadband NCB = 20°
1°Heating Reset
1°CoolingReset
70°
66°
AuxiliaryTemperature
Sensor(ATS)
AuxiliaryTemperature
Sensor(ATS)
Figure 11: Temperature Reset Examples
MS Series Product Bulletin 13
Table 3: Functions and Settings
MS1 MS2 MS4 Setting Setting Range
Mode Selection
D = Direct (Cooling)
R = Reverse (Heating)
B = Deadband (Direct and Reverse)
I = Independent Setpoint (Direct and Reverse)
Setpoint -40 to 99°F (-40 to 70°C)
Differential 1 F°/1 to 9 C°
Setpoint 2
D, R modes 1 to 40F° (1 to 40C°)
B mode 2 to 40F° (2 to 40C°)
I mode Low to High Setpoint Stop
Differential 2 1 to 9F° (1 to 9C°)
Setpoint 3 1 to 40F° (1 to 40C°)
Differential 3 1 to 9F° (1 to 9C°)
Setpoint 4 1 to 40F° (1 to 40C°)
Differential 4 1 to 9F° (1 to 9C°)
Low Setpoint Stop -40° to High Setpoint Stop
High Setpoint Stop Low Setpoint Stop to 99°F (70°C)
Interstage Time Delay 3 to 90 seconds
Anti-short Cycle Timer, Direct 0 to 9 minutes
Anti-short Cycle Timer, Reverse 0 to 9 minutes
Soft Start 0 to 99 minutes/1F° (1C°)
Heating Reset 0 to 6F° (0 to 6C°)
Cooling Reset 0 to 6F° (0 to 6C°)
Non-compensated Band 0 to 20F° (0 to 20C°)
Sensor Offset -20 to +20F° (-20 to +20C°)
Units Used 0 = °C
1 = °F
Display Refresh Rate 1 to 99 seconds
High Temperature Alarm 0 to 50F° (0 to 50C°) above Setpoint
Low Temperature Alarm -50 to 0F° (-50 to 0C°) below Setpoint
Alarm Differential 1 to 9F° (1 to 9C°)
Alarm Time Delay 0 to 99 minutes
Binary Input Function 0 = No binary input
1 = Shutoff and alarm signaling
2 = Setback
3 = Remote shutoff
Setback 0 to 20F° (0 to 20C°)
Binary input Time Delay 0 to 99 minutes
14 MS Series Product Bulletin
MS1 – One Stage Electronic
Temperature Control
The MS1 control is designed for 1-stage temperature and alarm control applications. This model uses the A99B Series temperature sensors.
Internal toControl
PowerSupply
Stage
SCS1
Alarm+-
V1 V2 C1
ProcessSensor
SensorCommon
A+ A-
Terminal Not Used
Refer to Rating Table for more information.
Figure 12: MS1 DIN Rail Mount Wiring
Table 4: Rating Table
Rating Category 120 VAC
240 VAC
24 VDC
Horsepower 1/4 1/2 -
Full Load Amperes 5.8 4.9 -
Locked Rotor Amperes 34.8 29.4 -
Inductive (non-motor) Amperes
8 8 8
Pilot Duty VA 275 450 -
Alarm circuit is 40 VDC, 100 mA maximum.
Alarm requires separate power source.
Power supply is 24 VAC.
Modes of Operation
Direct (Cooling)
Reverse (Heating)
Temperature Management Settings
Setpoint
Differential (Hysteresis)
Low Setpoint Stop
High Setpoint Stop
Anti-short Cycle Timer
Soft Start
Temperature Sensor Offset
Temperature Units Used
Display Refresh Rate
Alarm Management Settings
High Temperature Alarm
Low Temperature Alarm
Alarm Differential
Alarm Time Delay
Table 5: Ordering Information
Product Code Number
Description
MS1DR24T-11C MS1 DIN Rail Mount Control;
A99BB-200C sensor included;
shipping weight 0.75 lb (340 g)
MS Series Product Bulletin 15
MS2 – Two Stage Electronic
Temperature Control
The MS2 control is designed for 2-stage temperature control applications. These models use the A99B Series temperature sensors.
Internal to Control
ProcessSensor
Binary Input
Stage
Stage
Power Supply
V1 V2
CD
C1
SC C2S1 D
Sensor Common
BinaryCommon
Terminal Not Used
Refer to Rating Table for more information.
Figure 13: MS2 DIN Rail Mount Wiring
SCDV1 V2
Internal to Control
ProcessSensor
BinaryInput
Binary and Sensor Common
PowerSupply
C1 C2
Stage
Stage
Terminal Not Used
Refer to Rating Table for more information.
Figure 14: MS2 Panel Mount Wiring
Table 6: Rating Table
Rating Category 120 VAC
240 VAC
24 VDC
Horsepower 1/4 1/2 -
Full Load Amperes 5.8 4.9 -
Locked Rotor Amperes 34.8 29.4 -
Inductive (non-motor) Amperes
8 8 8
Pilot Duty VA 275 450 -
Power supply is 24 VAC.
Modes of Operation
Direct (Cooling)
Reverse (Heating)
Deadband (Cooling and Heating)
Independent Setpoint (Cooling and Heating)
Temperature Management Settings
Multiple Setpoints
Multiple Differentials (Hysteresis)
Low Setpoint Stop
High Setpoint Stop
Interstage Time Delay
Anti-short Cycle Timers
Soft Start
Temperature Sensor Offset
Temperature Units Used
Display Refresh Rate
Alarm Management Settings
High Temperature Alarm
Low Temperature Alarm
Alarm Differential
Alarm Time Delay
Binary Input Management Settings
Binary Input Function Selection
Binary Input Time Delay
Setback
Table 7: Ordering Information
Product Code Number
Description
MS2DR24T-11C MS2 DIN Rail Mount Control;
A99BB-200C sensor included;
shipping weight 0.79 lb (360 g)
MS2PM24T-11C MS2 Panel Mount Control;
A99BB-200C sensor included;
shipping weight 0.53 lb (240 g)
16 MS Series Product Bulletin
MS4 – Four Stage Electronic
Temperature Control
The MS4 control is designed for 4-stage temperature control applications. These controls use the Johnson Controls/PENN A99B temperature sensor.
SCS2 S1DV1 V2
Internal to Control
C
Stage
Stage
Stage
Common
PowerSupply
BinaryInput Binary / Sensor
CommonAuxiliary Temperature Sensor
ProcessSensor
Refer to Rating Table for more information.
Figure 15: MS4 Panel Mount Wiring
Internal to Control
AuxiliaryTemperature Sensor
Stage Stage Stage
Stage
CDD S2SC
Power Supply
C1 C4
C2
C3V1 V2
ProcessSensor
Binary Input
Sensor Common Binary and Sensor Common
Terminal Not UsedSee Rating Tablefor more information.
Figure 16: MS4 DIN Rail Mount Wiring
Table 8: Rating Table
Rating Category 120 VAC
240 VAC
24 VDC
Horsepower 1/4 1/2 -
Full Load Amperes 5.8 4.9 -
Locked Rotor Amperes 34.8 29.4 -
Inductive (non-motor) Amperes
8 8 8
Pilot Duty VA 275 450 -
Power supply is 24 VAC. Relay outputs must not exceed
20 amperes total connected load.
Modes of Operation
Direct (Cooling)
Reverse (Heating)
Deadband (Cooling and Heating)
Independent Setpoint (Cooling and Heating)
Temperature Management Settings
Multiple Setpoints
Multiple Differentials (Hysteresis)
Low Setpoint Stop
High Setpoint Stop
Interstage Time Delay
Anti-short Cycle Timers
Soft Start
Heating Reset
Cooling Reset
Non-compensated Band
Temperature Sensor Offset
Temperature Units Used
Display Refresh Rate
Alarm Management Settings
High Temperature Alarm
Low Temperature Alarm
Alarm Differential
Alarm Time Delay
Binary Input Management Settings
Binary Input Function Selection
Binary Input Time Delay
Setback
Table 9: Ordering Information
Product Code Number
Description
MS4DR24T-11C MS4 DIN Rail Mount Control;
includes one A99BB-200C sensor;
shipping weight 1.17 lb (530 g)
MS4PM24T-11C MS4 Panel Mount Control;
includes one A99BB-200C sensor;
shipping weight 0.90 lb (410 g)
MS Series Product Bulletin 17
Table 10: Replacement Sensor Ordering Information
Product Code Number
Operating Range Cable
A99BB-200C
-40 to 212oF (-40 to 100oC)
6-1/2 ft (2 m) PVC
A99BB-300C 9-3/4 ft (3 m) PVC
A99BB-500C 16-3/8 ft (5 m) PVC
A99BB-600C 19-1/2 ft (6 m) PVC
A99BA-200C 6-1/2 ft (2 m) Shielded
Table 11: Electrical Ratings of Contacts
Rating Category 120 VAC 240 VAC 24 VDC
Horsepower 1/4 1/2 ---
Full Load Amperes 5.8 4.9 ---
Locked Rotor Amperes 34.8 29.4 ---
Inductive (non-motor) Amperes 8 8 8
Pilot Duty VA 275 450 ---
Relay outputs must not exceed 20 amperes total connected load. Open collector transistors on the MS1 alarm circuits have a
maximum rating of 40 VDC, 100 mA. Alarm requires separate power source.
Specifications
Product MS Series One-and Multi-Stage Electronic Temperature Controls
Power Requirements 3.7 VA @ 24 VAC, 50/60 Hz, Class 2 (20-30 VAC)
Accuracy 1.8F°( 1C°)
Ambient Conditions Operating: +14 to +140°F (-10 to +60°C); 0 to 95 % RH (non-condensing)
Storage: -22 to +176°F (-30 to +80°C); 0 to 95 % RH (non-condensing)
Agency Listings UL Recognized: File E194024, CCN XAPX2
Canadian UL Recognized: File E194024, CCN XAPX8
FCC Compliant per Class A Digital Device, Part 15
Canadian DOC Compliant per Class A, Radio Interference Regulations
Dimensions (H x W x D) Panel Mount: 1.38 x 2.95 x 2.68 in. (35 x 75 x 68 mm)
DIN Rail: 4.65 x 2.76 x 2.07 in. (118 x 70 x 52.5 mm)
Shipping Weight See ordering information in Tables 5, 7, and 9.
The performance specifications are nominal and conform to acceptable industry standards. For application at conditions beyond these specifications, consult Johnson Controls/Penn Refrigeration Application Engineering at (414) 274-5535. Johnson Controls shall not be liable for damages resulting from misapplication or misuse of its products.
www.penncontrols.com
® Johnson Controls and PENN are registered trademarks of Johnson Controls in the United States of America and/or other countries. All other trademarks used herein are the property
of their respective owners. © Copyright 2018 by Johnson Controls. All rights reserved.
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